Application for iPhone,iPad and Android

Hello Freelancers, I want to create a mobile application. it´s something like a loyalty app we want make a direct communication channel between the client and the store something like [login to view URL] the idea is make the possibility to send offers directly to the client smartphone and make a control of the use of thats offers.... at first i will begin with something simple not too complicate, but with the possiblity of make it bigger apple and android if you look in the play store for Groupalia, i´m thinking in something like that. my budget is low at present please be in mind. Thanks - Globalsquares